Electro-Voice MDM-1 Owner's manual

Brand: Electro-Voice

Model: MDM-1

Type: Owner's manual

Electro-Voice MDM-1 is a professional-grade digital audio module designed to receive and process digital audio signals in various formats. It features AES/EBU and SPDIF inputs, allowing for flexible connectivity with a wide range of digital audio sources. The MDM-1 can be used for various applications, including broadcast, studio recording, live sound reinforcement, and home theater systems. With its advanced digital audio processing capabilities, the MDM-1 offers high-quality audio performance and versatility for various professional audio applications.

APPLICATION NOTE

MDM-1 SPDIF COMPATABILITY

This application note details the construction of an adapter that enables

the MERLIN™ Digital Module to receive SPDIF signals.

Introduction

The MDM-1 was designed to receive SPDIF format digital signals

through the use of an easily constructed adapter. The adapter is neces-

sary due to differences in the physical and electrical specifications of the

AES/EBU and SPDIF standards.

Materials, Tools, and Test Equipment Required

The construction of the adapter requires the following materials and tools:

Switchcraft 324 RCA female to XLR male adapter or equivalent

Electronic grade solder

237 Ohm 1% or 240 Ohm 5% resistor (

watt)

Soldering Iron

Needle nose pliers

Diagonal cutters

Small slotted screwdriver

VOM or DMM

Construction

Construct the adapter as depicted in Figure 1.

An RCA female connector,

XLR Male connector, and

appropriate shielded cable

can be substituted for the

adapter.

The

watt resistor should just fit inside the hood of the XLR. If you are

concerned about the size of the resistor, you can use a

watt resistor.

The use of this adapter creates an unbalanced line. Unbalanced digital

lines suffer from the same problems as unbalanced audio lines. There-

fore, the installation rules that apply to unbalanced audio lines apply to

unbalanced digital lines. If a cable run is long (i.e. outside a rack), then

the adapter can be built into the cable. The use of cable, such as

RG–59, with a characteristic impedance of 75 Ohms is recommended for

all cable runs.

Figure 1 – Adapter Schematic

APPLICATION NOTE

Test

The finished adapter should present the following readings upon test with a

VOM or DMM.

TP1 to TP2 Measurement

RCA center pin RCA shield 237 Ohm

XLR pin 2 RCA center pin short

XLR pin 1 or 3 RCA shield short

XLR pin 1 XLR pin 3 short

XLR pin 2 XLR pin 1 or 3 237 Ohm

Software Configuration

The ISP-100 will automatically detect the incoming SPDIF data stream and

configure itself appropriately.

Telex Communications, Inc. Minneapolis, MN 55420

Printed in USA Tel 612.884.4051 Fax 612.884-0043 42–07–053086

Electro-Voice MDM-1 Owner's manual

Electro-Voice MDM-1 Owner's manual

Electro-Voice MDM-1 Owner's manual

Related papers

Other documents